claude-in-chrome: tabs_context_mcp fails with "No group with id" even after browser confirms connected

Environment: Windows, Opera browser, Claude Code CLI

Steps to reproduce:

1. Connected the claude-in-chrome extension to Opera browser
2. Called list_connected_browsers — correctly shows one browser connected (isLocal: true)
3. Called select_browser with that deviceId — succeeds ("Connected to browser...")
4. Called tabs_context_mcp with createIfEmpty: true — fails

Actual behavior:
Every call to tabs_context_mcp fails with:
Failed to query tabs: No group with id: <random number>

The group ID is different (and presumably invalid/nonexistent) on every single attempt, across 4+ retries over ~10 minutes, including after re-selecting the browser and trying tabs_create_mcp directly (which correctly reports no group exists, then fails to create one via the documented flow).

Expected behavior:
tabs_context_mcp with createIfEmpty: true should create a new tab group for the session when none exists, per its own documented behavior.